Blind-stitching presser-foot for zig-zag sewing machines



June 13, 1939. P. BOGUHN ET AL 2,162,212

BLIND-STITCHING PRESS ER FOOT FOR ZIG-ZAG SEWING MACHINES Filed March 23, 1957 Elli Ming? gwumeozm PauZ fio gu/uz and Richard ,Boclzmann 352/.

Patented June 13, 1939 2,162,212 PATENT GFFEE BLIND-SWITCHING PRESSER-FOOT FOR ZIG-ZAG SEWING MACHENES Paul Boguhn, Berlin, and Richard Boohmann, tiittenberge, Potsdam, Germany, assignors to The Singer Manufacturing Company, Elizabeth, N. J., a corporation of New Jersey Application March 23, 1937, Serial No. 132,458 In Germany September 19, 1936 i Claims.

This invention relates to a blind-stitching presser foot for zigzag sewing machines fitted with a vertically yieldable work-guiding member, and has for an object to provide an improved construction in which the work-guiding member can rise and fall readily with variations in the thickness of the work.

According to the invention the work-guiding member is pivotally supported by the foot at the forward end of said member, i. e., at the end nearer to the operator.

In a practical construction the pivot for the work-guiding member is journalled in bosses of a bracket fitted to one toe portion of the bifurcated presser foot so as to be adjustable transversely of the direction of feed. The work-guiding member is thus laterally adjustable besides having freedom to rise and fall in the gap between the toe portions of the foot.

A torsion spring coaxial with the pivot of the work-guiding member urges the work-guiding member in downward direction.

In the accompanying drawing, Fig. 1 is a front elevation of a blind-stitching presser foot embodying the invention, Fig. 2 a side elevation, Fig. 3 a top plan view, and Fig. 4 a vertical section on the line a--b of Fig. 3 showing the presser foot operatively engaging a blind seam in course of formation. Figs. 5 and 6 are detail perspective views illustrative of the formation of the blind seam.

Referring to the drawing, the improved blindstitching presser foot, which is adapted to be secured to the presser-bar in the usual way, consists of the shank l and the sole 2, the latter being bifurcated to constitute an upturned toe member 3 of the usual form and a complementary laterally enlarged member or plate l5. Formed in the upper face of the plate I 5 is a slideway It in which is fitted tobe adjustable transversely of the direction of feed a bracket 8 formed with an elongated slot l6 through which passes the stem of a headed screw I! threaded into an orifice in the plate l5 and serving tosecure the bracket t in its position of adjustment.

At its forward end the bracket 8 is formed with two co-axial spaced bosses 6 and l in which is journalled a pivot-pin 5 carrying on its left-hand end the work-guiding member 4 which is movable vertically, about the axis of the pivot-pin 5, in the gap between the toe portion 3 and the plate iii. The pivot-pin 5 is secured against axial shift relatively to the bosses 6 and 1 by'a cotter 9. That portion of the pivot-pin 5 extending between the bosses ii and 'l is embraced by a torsion spring II one end of which is anchored to the bracket 8 and the other out-turned end I3 of which enters an orifice Ill in the workguiding member 4, urging the member 4 downwardly below the plane of the sole 2. Excessive (Cl. 1ll2-151) displacement of the member 4 under the action of the spring H is limited by the end l3 of the spring engaging the upper face of the bracket 8.

As will be seen from Fig. 2, the member 4 is deeper at its rearward end, than at its forward end.

By loosening the screw I1 and sliding the bracket 8 in the slideway i i of the plate l5, the member l can be adjusted laterally in relation to the needle 5 9 as required for blind stitching materials of different thicknesses and according to the kind of work to be performed.

The sole 2 is preferably formed on its under face with a groove l8 extending in the direction of feed in a region behind the needle IS, in the left-hand position of the needle, and to the left thereof, sothat the fabric may be properly guided during the blind-stitching operation, as shown in Fig. 4.

What is claimed is:

1. The combination with a sewing machine presser-foot having spaced toe portions one of which is formed in its upper face with a slideway, of a bracket adjustable in said slideway transversely of said toe portions, and a vertically yieldable work-guiding member pivoted at its forward end to said bracket with freedom to rise and fall in the space between said toe portions.

2. The combination with a sewing machine presser-foot having spaced toe portions one of which is formed in its upper face with a slideway, of a bracket adjustable in said slideway transversely of said toe portions, means for securing said bracket in its position of adjustment, and a vertically yieldable work-guiding member pivoted at its forward end to said bracket with freedom to rise and fall in the space between said toe portions.

3. The combination with a sewing machine presser-foot having spaced toe portions one of which is formed in its upper face with a slideway, of a bracket adjustable in said slideway transversely of said toe portions, said bracket formed with bosses, a work-guiding member unitary with a pivot journalled in said bosses and having freedom to rise and fall in the space between said toe portions, said work-guiding member extending rearwardly from said pivot, and spring means urging said member in downward direction.

4. A sewing machine presser-foot having a shank, a sole-plate carried by said shank and formed with a needle-opening and spaced toeportions in advance of the needle-opening, a bracket laterally adjustably mounted on one of said toe-portions, and a blind-stitching edgeguide pivoted at its forward end to saidbracket with freedom to rise and fall in the space between said toe-portions.

PAUL BOGUHN. RICHARD BOCHMANN. 

